BA1451 [ROHM]
AM radio / FM IF stereo system IC; AM收音机/调频中频音响系统IC
| 型号： | BA1451 |
| 厂家： | 
ROHM |
| 描述： | AM radio / FM IF stereo system IC |
| 文件： | 总8页 (文件大小：137K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
BA1451F
Audio ICs
AM radio / FM IF stereo system IC
BA1451F
The BA1451F is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX. It has been developed for HiFi
component applications.
The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes.
In particular, the laser lock technique used in the VCO means that no external adjustment is required.
!Applications
Synthesized tuner for HiFi components.
!Features
1) Built-in AM monaural radio, FM IF amplifier/detector, and FM stereo demodulator.
2) DTS (both SD and IF count) compatible.
3) Built-in reference voltage power supply provides good shortwave band frequency stability.
4) Good FM stability.
5) The FM MPX VCO uses laser locking making adjustment and external components unnecessary.
6) Built-in forced monaural operation function for MPX (VCO stops, and LED goes off).
7) Low cutoff of audio is possible to improve AM fidelity.
8) MPX VCO stops in AM mode.
9) Audio muting is possible when an IF request is made.
!Block diagram
24
23
22
21
20
19
18
17
16
15
14
13
AM IF
AM
AM
OSC
MIX
SD
Vreg
AM
DET
AGC
1/2
1/2
SW
PD
FM
DET
FM
IF
VCO
LED
DRIVER
DECODER
COMP
8
SD
DET
Vcc
2
GND
4
1
3
5
6
7
9
10
11
12
BA1451F
Audio ICs
!Absolute maximum ratings
Parameter
Power supply voltage
Power dissipation
Symbol
VCC
Limits
9.0
Unit
V
1
∗
Pd
450
mW
˚C
Operating temperature
Storage temperature
Topr
Tstg
−25∼+75
−55∼+125
˚C
1 Reduced by 4.5mW for each increase in Ta of 1˚C over 25˚C.
∗
!Recommended operating conditions (Ta=25°C)
Parameter
Symbol
VCC
Min.
3.8
Typ.
5.0
Max.
8.0
Unit
V
Power supply voltage
!Input and output circuits
Quiescent voltage (V)
Function
Pin No.
Internal circuit
FM
AM
VCC
2
Vreg 23
FM IF amplifier input
Connect to an FM ceramic filter.
330Ω
1
2
3
2.1
2.1
1
GND
4
V
CC
5.0
5.0
3
VCC
2
FM tuning ON level adjustment
Connect a resistor from this pin to GND
to set the required ON level for
the tuning indicator.
0.25
0
15kΩ
GND 4
4
5
GND
0
0
5
VCC
2
FM discriminator
5.0
5.0
Connect to the discriminator coil.
5pF
GND 4
Tuning indicator
6/7
6
7
−
−
−
−
Connect to a tuning indicator
display device (eg. LED)
Stereo indicator
Connect to a stereo indicator
display device (eg. LED)
GND 4
BA1451F
Audio ICs
Quiescent pin voltage (V)
Pin No.
Function
Internal circuit
MUTE
FM
AM
· IF request
IF OUT
10kΩ
Output the IF signal to pin9 excess
of 4.0V.
Stops the IF signal at equal to or less
than 3.0V.
8
10k
Ω
8
0
0
· MUTE
Apply to muting excess of 2.0V.
Off the muting at equal to or less
than 1.0V.
GND 4
V 2
CC
IF output
9
9
4.2
4.2
Output for the IF signal.
GND 4
V 2
CC
10
11
R-channel output
L-channel output
1.5
1.5
1.5
1.5
10/11
GND 4
reg 23
12
V
· PLL filter
Connect to a lag/lead filter.
AM/FM
12
2.1
0
· AM / FM band switch
AM band when connected to GND.
GND 4
· Forced monaural
13
V
reg 23
Forced monaural operation connecting
to get a resistor to mediate.
(Recommended value : 10kΩ to
ground.)
MONO
13
2.1
2.1
· Pilot filter
GND 4
Connect to a capacitor.
BA1451F
Audio ICs
Quiescent pin voltage (V)
Function
Internal circuit
Pin No.
FM
AM
MPX input
V
CC
reg
2
14
15
2.1
2.1
Input the FM detector output .
23
V
14
15
MPX input
2.1
2.1
2.1
2.1
Input the AM detector output after
low cut.
GND 4
V
CC
2
AM/FM detector output
16
17
18
16
5kΩ
Connect to the following stage MPX and
FM low pass filter.
GND 4
17
V
CC 2
AM AGC
0
0
Connect to a capacitor.
20kΩ
GND 4
V
CC
2
18
AM IF input
5.0
5.0
Connect to an AM ceramic filter.
GND 4
19
V
CC
reg
2
AM mixer output
23
V
19
20
5.0
2.1
5.0
2.1
Connect to primary side of AM IFT.
20
AM antenna
Connect to AM antenna.
GND 4
BA1451F
Audio ICs
Quiescent pin voltage (V)
Function
Internal circuit
Pin No.
FM
AM
21
V 2
CC
FM detector bandwidth adjustment
21
2.1
2.1
Connect a resistor from this pin to the
reference voltage supply to set the
required detector bandwidth.
4.3kΩ
GND 4
Reference voltage supply
Connected to a capacitor.
23
22
2.1
2.1
2.1
2.1
AM local oscillator
22
V
reg 23
Connect to the AM OSC circuit.
24
AM local oscillator output
AM OSC output.
24
1.7
1.4
GND 4
!Electrical characteristics (Unless otherwise specified, Ta=25°C and VCC=5V)
N
FM IF MPX signal source : fi =10.7MHz, modulation 1kHz, 75kHzdev (100%)
19kHz 7.5kHzdev (10%)
N
: fi =1000kHz, modulation 1kHz 30%
AM
Parameter
Symbol
Min.
13
Typ.
21
Max.
29
Unit
mA
mA
Conditions
Q (FM)
Quiescent current FM
Quiescent current AM
<FM IF MPX>
I
No input
No input
Q (AM)
I
11
19
27
Detector output voltage
−3dB limiting sensitivity
Signal-to-noise ratio
Channel balance
VO
340
34
72
−2
45
35
−
34
70
300
480
37
670
40
−
+2
−
mVrms
dBµV
dB
V
IN=100dBµV,mono
L.S
mono
S / N
C.B
80
V
IN=100dBµV, mono
IN=100dBµV, mono
0
dB
V
AM suppression ratio
Channel separation
Total harmonic distortion
Station detector sensitivity
Station detector bandwidth
IF OUT output voltage
<AM>
AMR
SEP
THD
55
dB
AM : VIN=60dBµV, mod=30% , 400Hz
V
45
−
dB
IN=100dBµV, main
IN=100dBµV, main
0.5
39
1.6
44
150
530
%
V
S
SD
dBµV
kHz
mVP-P
Input for pin 6 current ≥ 1mA
IN=100dBµV, mono
IF request ON
SW
SD
100
400
V
IF
V
VO
70
22
90
25
120
28
mVrms
dBµV
dB
V
IN=68dBµV
Detector output voltage
Usable sensitivity
Q.S
Input for S / N = 20dB
S / N
THD
42
52
−
1.8
V
V
IN=68dBµV
IN=68dBµV
Signal-to-noise ratio
Total harmonic distortion
Station detector sensitivity
IF OUT output voltage
Local buffer output voltage
−
21
0.6
26
%
S
SD
31
dBµV
mVP-P
mVrms
Input for pin 6 current ≥ 1mA
IF request ON
IF
V
300
140
400
200
530
280
OBuff
V
BA1451F
Audio ICs
!Test circuit
47p
AM STEREO
T2
L4
50
STEREO
MONO
100p
0.022
22
100
10
OSC OUT
10k
20k
100
6800p
1
0.022
Vreg
0.022
AM SG
24
23
22
21
20
19
18
17
16
15
14
13
SG
OSC
DET
MIX
Vreg
MPX
SD
MUTE
REQ.
DET
LED
1
2
3
4
5
6
7
8
9
10
11
12
Vcc
GND
0.022
TUN.
ST.
AM
FM
0.22
FM SG
SG
0.022
0.01
OFF
MUTE
IFREQ
FM STEREO SG
3.9k
0.01
1
SG
24k
3.3k
50
100
0. 022
+B
IF OUT
R-ch
L-ch
0.047
L4 : AM OSC
T2 : AM IFT
CD1 : FM DISCRIMINATOR COIL
Sumida
Toko
Toko
Sumida
Toko
2157-JPS-029
A7BRS-12445X
CFMA-258
0236-JPS-101
A119ACS-19197N
Units : R [Ω]
C [µF]
Fig. 1
BA1451F
Audio ICs
!Application example
24
23
22
21
20
19
18
17
16
15
14
13
OSC
OUT
Vreg AM BW Adj AM IN MIXOUT IFIN AGC DET MPX MPX SD
8
1
7
6
5
4
OSC
AM
AM
OUT IN
IN
/
MONO
BA4425F
BA1451F
2
3
MUTE
/
PD
/
BPF
FMIN
1
V
DD SD Adj GND FM DET TUN ST IF REQ IF OUT Rch
Lch AMFM
2
3
4
5
6
7
8
9
10
11 12
Vcc (5V)
Lch OUT
Rch OUT
18
17
16
15
14
13
12
11
P1
10
GND PD2 PD1
V
DD FMIN AMIN P2
P0
Vcc2 (+9V)
BU2616F
XOUT XIN
CE
3
DA
4
CL TUN SD IFIN
P3
9
1
2
5
6
7
8
DA
CE
CL
TUNING
TO LED etc.
STEREO
µ-COM
Fig. 2
!Electrical characteristic curves
180
170
110
100
11
10
S+D+N
0
160
150
90
80
9
8
−10
f
V
IN=10.7MHz,
IN=100dBµ,
V
O
7
−20
−30
−40
−50
−60
−70
−80
∆f=±22.5kHzdev.
(pilot=±7.5kHzdev)
140
130
70
60
7
6
f
IN=1kHz,
6
5
4
3
2
1
0
Ta=25˚C,
RSD=20kΩ
AMR
L→R
R→L
SEP
L→R
120
110
50
40
5
4
V
cc=5V,
R→L
TUNED ON
f
IN=10.7MHz,
fm=1kHz
−3dB L.S.
∆f=±22.5kHzdev,
pilot=±7.5kHzdev
Ta=25˚C,
AMR MOD=30%,
fm=400Hz
100
90
80
30
20
10
3
2
1
N
D+N (100%)
D+N (100%)
D+N (30%)
D+N (30%)
7
−90
70
0
0
−
20
0
20
40
60
80
100 120
3
4
5
6
8
9
INPUT VOLTAGE : VIN
(dBµ)
POWER SUPPLY VOLTAGE : VCC (V)
Fig.3 FM input / output characteristics
Fig.4 FM characteristics vs.
power suppy voltage
BA1451F
Audio ICs
10.80
60
50
40
30
20
10
0
SEP
L→R
2
1
0
10.75
10.70
10.65
R→L
Vcc=5V
IN=10.7MHz
IN=100dBµ
f
V
∆f=±22.5kHzdev
pilot=±7.5kHzdev
Ta=25˚C
R
L
MAIN
10.60
10.55
THD
R
BW=20kΩ, VIN=100dBµ
SUB
Ta=25˚C
MONO
3
8
9
4
5
6
7
200 500 1k 2k 5k 10k 20k
FREQUENCY : fm (Hz)
50 100
POWER SUPPLY VOLTAGE : Vcc (V)
Fig.6 Channel separation and
THD vs. frequency
Fig.5 FM bandwidth vs.
power supply voltage
100
90
10 100
10
3.0
2.0
S+D+N
9
8
90
80
0
Vo
80
−10
70
60
50
7
6
5
70
60
50
S / N=20dB
f
V
IN=1000kHz,
IN=74dBµ,
MOD=30%
=1kHz,
10
9
−20
−30
VAGC
8
7
6
5
4
3
2
1
0
f
m
Ta=25˚C
40
30
4
3
40
30
−40
−50
TUNED ON
D+N (80%)
1.0
0
N
V
f
OUT=5V,
IN=1000kHz,
=1kHz
Q.S.
20
10
0
2
1
0
20
10
0
D+N (80%)
D+N (30%)
f
m
−60 MOD=30%,
Ta=25˚C
D+N (30%)
7
LED ON
−70
120
50
100
dBµ)
0
3
4
5
6
8
9
−20
INPUT VOLTAGE : VIN
(
POWER SUPPLY VOLTAGE : VCC (V)
Fig.7 AM input / output characteristics
Fig.8 AM characteristics vs.
power suppy voltage
!External dimensions (Units : mm)
10
0
V
O
−10
−20
−30
−40
V
CC
IN
IN
=
5V
1000MHz
74dBµ
MOD 30%
Ta 25˚C
15.0 ± 0.2
f
=
10
V
=
24
13
=
=
D+N (80%)
1
12
5
0
−50
1.27
0.4 ± 0.1
0.3Min.
−60
−70
D+N (30%)
0.15
50 100 200 500 1k
2k
5k
10k 20k
FREQUENCY : fm (Hz)
SOP24
Fig.9 AM detector output and
THD vs. frequency
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